subject: Problems When Faceing Car Fault Diagnosis [print this page] Automotive failures are frequently encountered problems, how to better solution?
First of all, to find the appropriate maintenance information. For the system to be equipped with self-diagnostic check of the car, the first step in diagnosis is to find the appropriate maintenance information. Repair of motor vehicles must have a manual, which can not speculate, guess, if it can not find the original vehicle specifications, with similar models for reference, but would pay attention to data differences. In addition, the best auto repair service has to be informed. Better vehicle fault detection technology is launch x431. At the same time, must have car circuit diagram and chart, without a corresponding circuit for the fault diagnosis system is very difficult, even impossible. Manufacturer's maintenance manual, general maintenance manual or data system maintenance procedures must contain the information. Diagnosis can be dedicated to indicate whether the output of sensor failure, but can not display the fault is with the sensor itself or out in the lead, we must have the appropriate inspection procedures to determine the exact cause of the malfunction. A parts manual can help find the location of a certain car parts, to save time. The occurrence of car trouble with a random, chance events are, should the establishment of a branch graph, and use it to analyze the failure, it will help to clarify the mechanism of failure occurs, in addition to qualitative analysis, it can under the tree diagram Factors affecting the occurrence probability of fault quantitatively predict the likelihood of failure (ie failure probability), we are concerned about the car in time problem.
Failure to find the second positive. Some cars are difficult to diagnose intermittent fault, unless you check the car in time to failure appear. In other words, when we carry out diagnostic testing, fault symptom does not appear, failure would be difficult to diagnose. When a fault occurs, immediately direct to the site to diagnose faults. We know that the testing technology is the launch x431, lexia3, mb star. This method is particularly applicable to the fault can not start. If this occurs, it shall inform the customer not to try to start the car. This cost may be high, but sometimes, this may be successful in the only way to diagnose the cause. Must be more than happy for customers ran several kilometers diagnosis, troubleshooting. In the automotive repair, if the computer is equipped with removable "Programmable Read Only Memory", you must have the latest "Programmable Read Only Memory" refresh information. If do not have such knowledge, while car manufacturers are recommended replacement "programmable read only memory" to fix a special driving performance, it will check the diagnosis of a waste of time.
Third, we must understand the basics of car, car diagnostic parameters should be detailed. Automotive diagnostic parameter is an important part of diagnostic techniques. Without direct measurement of the disintegration of the structure parameters under very difficult and must therefore be described by the state parameters. Now used to describe the system components and the nature of the state parameters of the process known as diagnostic parameters. To rational use of vehicle inspection technology, such as lexia3. Structural changes in a number of state parameters may cause the changes. The choice of which state parameters as a diagnostic parameter, should be technically and on the comprehensive analysis to determine.
Finally common sense to note is that the failure to know the engine can also generate diagnostic trouble codes, diagnostic trouble code is not necessarily so is the engine of a computer system component failures. For example, if the exhaust valve burned out because of the cylinder compression Ershi worse, and diagnostic trouble code oxygen sensor has been shown to provide the oxygen signal.Please note that some of the use of technology, such as launch x431, lexia3, mb star.In fact, a large number of oil and gas mixture is not burning in the cylinder, the exhaust oxygen sensor to sense the flow of additional oxygen. Then to be able to decide in the end is the oxygen sensor failures or mechanical fault code on the reasons.
Rational use of cars diagnosis. Often used in automotive diagnostic technology mb star. In the course of cars, parts and general state of Chengdu in the assembly, its components can not directly test, for example, the wear volume of the cylinder, crankshaft bearing clearance, etc., in the case of the dissolution of the engine does not can not be measured. Therefore, the vehicles are an indirect measurement of the time of diagnosis, such as by vibration, noise, temperature measurement equal to indirectly diagnose technical condition of motor vehicles. As an indirect measurement method to judge, it will certainly bring some "inaccuracies", for example, engine work, the working status of the crankshaft main bearing can be divided into normal and abnormal state of both cases, if judged by the oil temperature bearing the characteristics of working conditions, and the oil temperature is divided into "normal", "too high" In both cases, it may produce false positives. Because the oil temperature is too high, of course, may be due to abnormal operation due to bearing, but may also be other reasons (such as the oil viscosity is inappropriate, insufficient oil, bad oil radiator, etc.) caused by the oil temperature rise.
